double str2sec(char *time);
long date2mjd(long y, long m, long d);
void mjd2date(int mjd, int &year, int &month, int &day);
void sun_pos(double dd, double &, double &, double &, double &, double &);
double *pb0r(int year,int month, int day);
double krabflux(double frq);